单项选择题

I only called the police when I ______ everything else.

A. tried
B. was trying
C. had tried
D. had been trying
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单项选择题
______ they found cheating at the exam, they would be expelled from the school.
A. If
B. Be
C. Were
D. Had
单项选择题
I saw lying on his doormat a letter ______ to him from the U.S.A.
A. addressing
B. addressed
C. to address
D. being addressed
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